Low-Inrush Power-Up Circuit for Deep Power-Down Exit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low energy integrated circuits face issues with large inrush currents during mode transitions, leading to battery depletion and operational irregularities, particularly in devices like hearing aids, where these currents generate unwanted tones and noises, and require large device geometries unsuitable for small layouts.
Innovation Solution
An inrush circuit is designed to control and generate inrush currents with specific operational parameters, using a regulator, bias generator, and enable circuit to manage transitions between modes, ensuring efficient battery usage and consistent operation by providing a controlled current that is consistent and efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inrush current is increased to enable faster mode transitions, then transition speed is improved, but battery depletion accelerates and operational irregularities increase
Solution Approach 1:
The inrush current circuit is activated preliminarily during mode transitions to provide the necessary current surge before the main power supply can respond. This preliminary action enables faster transitions without requiring a permanent increase in power supply capacity, thus avoiding accelerated battery depletion while maintaining transition speed.
Solution Approach 2:
The inrush current is dynamically controlled through a circuit that adjusts current levels based on the transition state. The circuit provides high current only during the brief transition period, then automatically reduces to normal operating levels, optimizing both transition speed and energy consumption by matching current supply to actual demand.
2Reliability
If inrush current is increased to improve transition performance, then operational reliability is improved, but harmful effects such as unwanted tones and noises increase
Solution Approach 1:
The inrush current circuit changes current parameters (amplitude, duration, ramp rate) to achieve reliable mode transitions without exceeding thresholds that generate harmful effects. By precisely controlling these parameters, the circuit ensures sufficient current for reliable transitions while staying below levels that cause unwanted tones and noises in hearing aid components.
Solution Approach 2:
The inrush current circuit acts as an intermediary between the power supply and the hearing aid components during mode transitions. It mediates the current flow, providing the necessary surge for reliable transitions while filtering and controlling the current to prevent harmful effects in sensitive components, thus decoupling the conflicting requirements.
3Reliability
If device geometry is increased to handle inrush currents, then current handling capability is improved, but device size increases making it unsuitable for small layouts
Solution Approach 1:
The inrush current handling capability is extracted into a dedicated separate circuit module rather than requiring the main power supply components to be oversized. This extraction allows the main hearing aid components to maintain small geometries while the specialized inrush circuit, optimized for current surge handling, provides the necessary current management in a compact form.
Solution Approach 2:
The power management function is segmented into two distinct parts: the main power supply circuit for normal operation and the dedicated inrush current circuit for transition management. This segmentation allows each circuit to be optimized independently, enabling small overall device geometry while maintaining adequate current handling capability through the specialized inrush circuit.
Data Source
AI summary
Systems, methods, and devices for providing power to low energy circuits include inrush circuits. Devices include a regulator that includes at least one driver device configured to generate a first current associated with a load comprising a low energy integrated circuit. Devices also include a bias generator configured to generate a second current to charge a load capacitor coupled with a power terminal of the low energy integrated circuit. Devices further include an enable circuit configured to enable the bias generator and disable the regulator responsive to a load voltage being below a threshold voltage, and further configured to enable the regulator to generate the first current and disable the bias generator responsive to the load voltage being above the threshold voltage.